fix: ensure the sandboxed preloads globals do not leak #17712
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nornagon
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@MarshallOfSound this is gonna need manual bp to |
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I was unable to backport this PR to "5-0-x" cleanly; |
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A maintainer has manually backported this PR to "5-0-x", please check out #17830 |
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A maintainer has manually backported this PR to "5-0-x", please check out #17830 |
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Description of Change
This PR re-adds the preload wrapping we used to have for sandboxed renderers that was accidentally removed as part of C71. It takes a different approach partially due to API changes in node and partially for performance reasons. Instead of wrapping the script at runtime, we wrap the scripts at build time.
This PR enables the
--standaloneflag for our browserify builds and then wraps the scripts with a fakemodule: { exports }. Standalone will ensure nothing leaks and the fake exports will ensure that nothing gets injected onto thewindowobject 馃憤Release Notes
Notes: Fixed issue where sandboxed renderers could sometimes leak globals outside of the preload script